EP1936188B1 - Vapour recovery pump and fuel dispenser - Google Patents
Vapour recovery pump and fuel dispenser Download PDFInfo
- Publication number
- EP1936188B1 EP1936188B1 EP06026313.4A EP06026313A EP1936188B1 EP 1936188 B1 EP1936188 B1 EP 1936188B1 EP 06026313 A EP06026313 A EP 06026313A EP 1936188 B1 EP1936188 B1 EP 1936188B1
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- EP
- European Patent Office
- Prior art keywords
- vapour
- chamber
- piston
- recovery pump
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000446 fuel Substances 0.000 title claims description 82
- 238000011084 recovery Methods 0.000 title claims description 65
- 239000004215 Carbon black (E152) Substances 0.000 claims description 7
- 229930195733 hydrocarbon Natural products 0.000 claims description 7
- 150000002430 hydrocarbons Chemical class 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
- F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
- B67D7/0476—Vapour recovery systems
- B67D7/0478—Vapour recovery systems constructional features or components
- B67D7/048—Vapour flow control means, e.g. valves, pumps
- B67D7/0482—Vapour flow control means, e.g. valves, pumps using pumps driven at different flow rates
- B67D7/0486—Pumps driven in response to electric signals indicative of pressure, temperature or liquid flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
- F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
- F04B17/044—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow using solenoids directly actuating the piston
Definitions
- the present invention relates to a vapor recovery pump and fuel dispenser for efficiently recovering fuel vapour from a tank of a vehicle.
- vapour recovery systems typically comprise a pump for removing fuel vapour, from the tank of the vehicle, by suction and feeding it back to the fuel container from which the fuel is fed to the vehicle. This mutual exchange of vapour/fuel is continuously performed when filling a vehicle with fuel.
- US-3,826,291 discloses a filling system for vehicle fuel, which system comprises means for recovering fuel vapour.
- the system has a fuel pump and a fuel meter with an output shaft which is connected to a fuel vapour pump which draws in vapour from the tank of the vehicle.
- the connection is by means of gear wheels in such manner that the volume of dispensed fuel corresponds to the volume of drawn-in vapour.
- Crank driven piston pumps are used, for example, and the motion of the piston is used on one side only, i.e. the piston is single-acting.
- US-5,123,817 discloses another filling system where a double-acting piston pump is used as vapour pump.
- a common shaft is connected between the piston pump and a fuel pump, which permits a coordinated direct operation of the fuel pump and the vapour pump.
- US-4,223,706 discloses a similar construction of a filling system where a flow of fuel through a hydraulic motor initiates the return flow of vapour through a vapour pump.
- a direct operation i.e. a common drive shaft, is available between the hydraulic motor and the vapour pump.
- An overflow valve is arranged between the inlet opening of the vapour pump and the fuel container of the filling system, to equalise pressure changes in the system.
- US-5,106,268 discloses an electromagnetic reciprocating pump which maintains the outlet pressure at a preset value comprising a pressure sensor for detecting the actual outlet pressure of the electromagnetic reciprocating pump and means to feedback control the frequency of the reciprocating motion and, if necessary, its stroke of the electromagnetic drive means based on the deviation from the preset outlet pressure of the actual outlet pressure.
- WO 93/16297 discloses a hydraulic engine apparatus and method that converts pulsed electromagnetic energy into mechanical force and motion.
- a reciprocating piston in a cylinder chamber acts on a fluid that is responsive to the pulsed electromagnetic energy.
- the cylinder chamber acts on a fluid that is responsive to the pulsed electromagnetic energy.
- the cylinder chamber is provided with check-valved input and output ports which are hydraulically coupled to a hydraulic motor.
- the piston has embedded permanent magnets that coact with the pulsating electromagnets to produce the reciprocating action.
- US 2005/053490 discloses an oscillating-piston drive for a vacuum pump with a piston, which has two piston sections and an intermediate zone provided with a drive magnet. Cylinder sections slidingly receive the piston sections. An annular recess is defined between the cylinder sections at a central yoke. The recess provides space for movement of the drive magnet.
- An electromagnetic drive which surrounds the piston includes yoke components and coils situated to the sides of said central yoke.
- US-5,957,113 discloses a fuel vapor recovery apparatus for automobiles that includes a canister for cooling and condensing the fuel vapor generated in the fuel tank and a membrane separation means for separating the fuel vapor flowed from the canister.
- the invention also provides for a membrane separation means for separating the fuel vapor from a canister storing fuel vapor into a fuel rich mixture and a means for liquefying and condensing this separated fuel rich mixture.
- a problem associated with prior art is relatively high production costs due to complex arrangements. Maintenance is cumbersome and many of the techniques are sensitive to leakage of vapour past the piston. Another problem is that some of the arrangements are rather bulky and takes a lot of space when mounted inside a fuel dispensing unit.
- vapour recovery pump that has a first chamber and a second chamber and a vapour flow passage connecting the first chamber with the second chamber.
- a particular object is to provide a double-acting vapour recovery pump that incorporates means that facilitates efficient control of the double-acting effect.
- vapour recovery pump and a fuel dispensing unit according to the respective independent claims.
- Preferred embodiments are defined in the dependent claims.
- a vapour recovery pump for a fuel dispensing unit comprising a pump housing with a first chamber and a second chamber, each chamber having a vapour inlet valve and a vapour outlet valve, respectively, the chambers being separated by a movable piston arranged to repeatedly decrease and increase the volumes of the chambers.
- a controllable vapour flow passage is connecting the first chamber with the second chamber, for transportation of vapour from one of the chambers to the other.
- the inventive vapour recovery pump is advantageous in that both sides of the vapour recovery pump may be used for transporting vapour, which renders the pump more insensitive for vapour leakage past the piston.
- the pump rate of the vapour recovery pump may be controlled by the control of the vapour flow passage.
- a controllable vapour flow passage is meant that the passage is controllable in respect of how much vapour that may be transported from one of the chambers to the other, i.e. the size of an opening in the vapour flow passage may be varied. Further, the direction of the flow of vapour may be controlled.
- the vapour flow passage may be arranged in the piston, and extend from one of the chambers, through the piston, to the other chamber.
- the vapour flow passage may be formed by tilting the piston, for allowing passage of vapour from one of the chambers, between the piston and the pump housing, to the other of the chambers.
- the vapour flow passage may be arranged external of the first chamber and the second chamber.
- the piston may comprise a magnetic device, for facilitating convenient control of the piston.
- the magnetic device is either a electromagnet, a permanent magnet or a combination thereof.
- the movable piston may have a first side facing the first chamber and a second side facing the second chamber, and electromagnetic control means may be provided to move the piston by altering a magnetic field, and the magnetic device may be arranged between the two sides of the piston, which provides a compact design of the vapour recovery pump.
- the two sides of the piston may each pass a common point along the direction of movement of the piston, when the volumes of the chambers are repeatedly decreased and increased, which results in increased pumping efficiency in respect of the total effective chamber size.
- the pump housing may comprise coils fed by a current for moving the piston, which also provides a compact design.
- the vapour flow passage may be configured to be substantially open when the piston decreases the volume of the first chamber, and be substantially closed when the piston increases the volume of the first chamber, the outlet valve of the second chamber and the inlet valve of the first chamber each being essentially open when the vapour flow passage is substantially closed.
- the pump may be used basically as a single sided pump, without causing excessive pressure build-up in any of the chambers.
- the vapour flow passage may comprise a controllable valve and a control unit for controlling the flow of vapour through the vapour flow passage, and the direction of through-flow of vapour may be selectable for the controllable valve, which further increases the control options of the vapour recovery pump.
- An overflow valve may be connected to both chambers.
- a third chamber defining a void may be connected, via a controllable valve, to any of the first chamber and the second chamber. Both features are advantageous in that excessive pressure build-up in the chambers is avoided.
- the vapour recovery pump may further comprise a first vapour line connected to the inlet valve of the first chamber, a second vapour line connected to the outlet valve of the first chamber, a third vapour line connected to the inlet valve of the second chamber, a fourth vapour line connected to the outlet valve of the second chamber, and a vapour circulation line comprising a valve and connecting any of the first vapour line with the second vapour line and the third vapour line with the fourth vapour line.
- a fuel dispensing unit for refuelling vehicles comprising a vapour recovery pump incorporating any of the features described above, wherein a vapour suction nozzle is connected to at least one of the two chambers via a vapour flow line, for transporting flammable fuel vapour.
- the inventive fuel dispensing unit is, inter alia, advantageous in that it has compact vapour recovery pump that offers a flexible regulation of the rate of vapour recovered via the vapour suction nozzle.
- the vapour suction nozzle may be connected to the first chamber via a first vapour flow line, and a second vapour suction nozzle may be connected to the second chamber via a second vapour flow line, which reduces the amount of components in the fuel dispensing unit.
- the fuel dispensing unit may further comprise a fuel dispensing nozzle arranged at the vapour suction nozzle, a fuel meter configured to measure an amount of fuel dispensed from the fuel dispensing nozzle, and a control device configured to regulate the vapour recovery pump such that the amount of recovered vapour substantially corresponds to the amount of dispensed fuel. Accordingly, this results in quite efficient control of the vapour recovery pump.
- the fuel dispensing unit may further comprise a detector configured to send a signal representative of the hydrocarbon content of the fuel vapour, the control device being configured to receive the signal and to prevent the recovering of vapour, if the hydrocarbon content of the fuel vapour is below a specific level.
- Fig. 1 illustrates a vapour recovery pump 1 that has a pump housing 2 with first chamber 3 that is separated from a second chamber 4 by a piston 9 that is movable along a main axis A of the pump 1.
- the volume of each chamber 3, 4 depends on the location of the piston 1, but the total volume of the chambers 3, 4 is constant.
- the first chamber 3 has an inlet valve 5 and an outlet valve 6, and the second chamber 4 has corresponding inlet valve 7 and a corresponding outlet valve 8.
- a first vapour inlet line 20 is connected to the inlet valve 5 of the first chamber 3 and a first vapour outlet line 21 is connected to the outlet valve 6 of the first chamber 3, while a second vapour inlet line 22 is connected to the inlet valve 7 of the second chamber 4 and a second vapour outlet line 23 is connected to the outlet valve 8 of the second chamber 4.
- the piston 9 has a magnetic device 11 arranged between a first side 12 and a second side 13 of the piston 9.
- the magnetic device 11 is a permanent magnet or an electromagnet.
- Electromagnetic control means 14 which will be further described below, during operation of the pump 1 induces an electromagnetic field that repeatedly and alternately attracts the magnetic device 11 towards a first side 43 of the pump 1 and towards a second side 44 of the pump 1, which causes an alternating increase and decrease of the volume of the chambers 3, 4.
- the piston 9 moves back and forth along the axis A, which means that each side 12, 13 of the piston passes a common point P on the axis.
- a vapour flow passage 10 is connected to the first chamber 3 near the first side 43 and to the second chamber 4 near the second side 44.
- the vapour flow passage has a valve 15 that is controlled by a control unit 16 in respect of how much vapour that may pass the vapour flow passage 10, and in which direction.
- the control unit 16 may set the valve 15 to be fully open, completely closed, or to an opening degree ranging from fully open to completely closed.
- the control unit 16 may also set the through flow direction of the valve 15.
- the valve 15 preferably comprises a first non return valve (not shown) that allows passage of vapour only from the first chamber 3 to the second chamber 4, and a second non return valve (not shown) that allows passage of vapour only from the second chamber 4 to the first chamber 3.
- Each non-return valve may be selectively opened or closed by the control unit 16.
- the pump 1 acts as a conventional double sided pump.
- the valve 15 permits a flow of vapour from the first chamber 3 to the second chamber 4 via the vapour flow passage 10, and when the piston 9 moves towards the first side 43, then the outlet valve 6 of the first chamber 3 and the inlet valve 7 of the second chamber 4 remain closed during operation (since pressure levels necessary to open these valves 6, 7 are not reached).
- the piston thereafter moves 9 to the second side 44, the inlet valve 5 of the first chamber 3 is opened for letting in vapour into the first chamber 3, while the outlet valve 8 of the second chamber 4 is opened for letting out vapour from the second chamber 4.
- valve 15 When the valve 15 permits a flow of vapour from the second chamber 4 to the first chamber 3 via the vapour flow passage 10, and when the piston 9 moves towards the second side 44, then the outlet valve 8 of the second chamber 4 and the inlet valve 5 of the first chamber 3 remains closed during operation (since pressure levels necessary to open these valves 5, 8 are not reached).
- the piston 9 thereafter moves to the first side 43, then the inlet valve 7 of the second chamber 4 is opened for letting in vapour into the second chamber 4, while the outlet valve 6 of the first chamber 3 is opened for letting out vapour from the first chamber 3.
- the pump 1 may also be used while keeping the vapour flow passage 10 closed.
- the mode of operation is as follows.
- the volume of the second chamber 4 When the volume of the first chamber 3 is increased the volume of the second chamber 4 is decreased. This causes a relatively lower pressure level in the first chamber 3, which causes its inlet valve 5 to open for letting in vapour, while a relatively higher pressure level is caused in the second chamber 4, which causes its outlet valve 8 to open for letting out vapour.
- the volume of the first chamber 3 is decreased, the volume of the second chamber 4 is increased, a relatively lower pressure level is caused in the second chamber 4, which causes its inlet valve 7 to open for letting in vapour, and a relatively higher pressure level is caused in the first chamber 3, which causes its outlet valve 6 to open for letting out vapour.
- the described operation mode may e.g. be used when two fuel dispensing pistols with vapour recovery nozzles are operated at the same time as is described in connection with Fig. 6 below.
- the electromagnetic control means 14 has a plurality of coils 37 arranged around the pump housing 2.
- the coils 37 are integrated in the pump housing 2.
- electrical currents are fed through the coils 37 which generate a magnetic field that attracts the piston 9, or more specifically, attracts the magnetic device 11 in the piston 9.
- the piston 9 is moved towards the first side 43.
- electrical currents are fed through coils near the second side 44 of the pump 1, which causes the piston to move towards the second side 44.
- the piston is moved back and forth.
- the flow passage and the valve 15 is incorporated in the piston 9.
- the control options (open, closed, direction of through flow) of the valves in this embodiment are identical to the valves of the previous embodiment.
- the valve 15 preferably comprises opening and closing members, which define the control options which in turn are susceptible to a magnetic attraction force.
- the control of the opening and closing members is performed by a magnetic field generated in a suitable manner by the electromagnetic control means 14.
- the piston 9 is tiltable such that a flow passage, or gap, is formed between the housing 2 and the piston 9, which allows vapour to pass directly from one chamber to the other.
- the functional effect of the tilting corresponds to the functional effect of the previously discussed valve 15.
- the piston is to permit passage of vapour from one chamber to the other, it is tilted, otherwise it is not.
- the tilting is preferably achieved by arranging two magnetic devices 11a and 11b at opposite sides of the piston, and by applying, by the electromagnetic control means 14, suitable asymmetrical magnetic attraction forces to these magnetic devices 11a, 11b.
- an overflow valve 17 is connected, via a vapour flow line, to both the first chamber 3 and the second chamber 4. If the pressure in one of the chambers 3, 4 for some reason exceeds an undesirable level, the overflow valve 17 opens for preventing the pump 1 from being damaged by excessive pressure levels.
- the first chamber 3 is connected to a third chamber 18 via a controllable valve 19a
- the second chamber 4 is connected to the third chamber 18 via another controllable valve 19b.
- corresponding valves 19a 19b are opened.
- a first vapour recirculation line 24 comprising a controllable valve 30a is connected to the first vapour inlet line 20 and to the first vapour outlet line 21.
- a second vapour recirculation line 25 comprising a controllable valve 30a is connecting the second vapour inlet line 22 with the second vapour outlet lien 23.
- valves 19a, 19b, 30a and 30b are, for example, connected to and controlled by the control unit 16.
- a fuel dispensing unit 36 incorporates a vapour recovery pump 1 according to the description above.
- the fuel dispensing unit 36 has a conventional first fuel dispensing pistol 40 with a fuel dispensing nozzle 27 and a vapour recovery nozzle 26.
- the fuel dispensing nozzle 27 is, via a first fuel line 31 that has a fuel meter 32, in fluid communication with an underground fuel storage tank 42.
- the fuel dispensing unit 36 has also a second fuel dispensing pistol 41 with a fuel dispensing nozzle (not shown) and a vapour recovery nozzle 28.
- the fuel dispensing nozzle is, via a second fuel line (not shown) that has a fuel meter (not shown), in fluid communication with an underground fuel storage tank 42.
- the vapour recovery nozzle 26 of the first pistol 40 is, via a first vapour recovery line 33, connected to the inlet valve of the first chamber of the pump 1.
- the vapour recovery line 33 has detector 39a that detects the level of hydrocarbon in the first recovery vapour line 33.
- the vapour recovery nozzle 28 of the second pistol 41 is, via a second vapour recovery line 34, connected to the inlet valve of the second chamber of the pump 1.
- the vapour recovery line 33 has also a hydrocarbon-detector 39b for detecting the level of hydrocarbon in the second recovery vapour line 34.
- the outlet valves of both chambers of the vapour recovery pump are connected to the fuel storage tank 42 via suitable vapour flow lines.
- a control device 38 is connected to the fuel meters, to the hydrocarbon-detectors and to the vapour recovery pump control unit 16.
- the vapour recovery pump control unit 16 is integrated in the control device 38.
- the rate of dispensed fuel is measured by the fuel meter 32.
- the control device monitor the rate of dispensed fuel and sends a signal to the vapour recovery pump 1 setting the vapour recovering rate, or pumping rate, to be equal to the fuel dispensing rate. If the detector 39a detects a predetermined, low level of hydrocarbon content, the vapour recovery pump is stopped. When filling a vehicle by means of the second pistol 41, a corresponding operation is performed.
- the described vapour flow passage between the two chambers of the vapour recovery pump 1 is open, such that vapour is drawn into the chamber that has its inlet valve connected to the vapour recovery line that belongs to the pistol that is used.
- the flow passage between the two chambers is closed.
Description
- The present invention relates to a vapor recovery pump and fuel dispenser for efficiently recovering fuel vapour from a tank of a vehicle.
- When filling the fuel tank of a motor vehicle, it is a common measure to recover the vapour escaping the tank when filling it with liquid fuel. This measure is taken for both safety and environmental reasons, since the fuel vapours are flammable and constitute a health hazard. The vapour recovery is achieved, for instance, by arranging a vapour suction nozzle next to the fuel dispensing nozzle of a pistol grip that is used for filling the tank with fuel. Vapour is then removed from the tank during filling, at a certain rate, which is often controlled by the standard rate. Vapour recovery systems typically comprise a pump for removing fuel vapour, from the tank of the vehicle, by suction and feeding it back to the fuel container from which the fuel is fed to the vehicle. This mutual exchange of vapour/fuel is continuously performed when filling a vehicle with fuel.
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US-3,826,291 , for example, discloses a filling system for vehicle fuel, which system comprises means for recovering fuel vapour. The system has a fuel pump and a fuel meter with an output shaft which is connected to a fuel vapour pump which draws in vapour from the tank of the vehicle. The connection is by means of gear wheels in such manner that the volume of dispensed fuel corresponds to the volume of drawn-in vapour. Crank driven piston pumps are used, for example, and the motion of the piston is used on one side only, i.e. the piston is single-acting. -
US-5,123,817 discloses another filling system where a double-acting piston pump is used as vapour pump. A common shaft is connected between the piston pump and a fuel pump, which permits a coordinated direct operation of the fuel pump and the vapour pump. -
US-4,223,706 discloses a similar construction of a filling system where a flow of fuel through a hydraulic motor initiates the return flow of vapour through a vapour pump. In this construction, a direct operation, i.e. a common drive shaft, is available between the hydraulic motor and the vapour pump. An overflow valve is arranged between the inlet opening of the vapour pump and the fuel container of the filling system, to equalise pressure changes in the system. -
US-5,106,268 discloses an electromagnetic reciprocating pump which maintains the outlet pressure at a preset value comprising a pressure sensor for detecting the actual outlet pressure of the electromagnetic reciprocating pump and means to feedback control the frequency of the reciprocating motion and, if necessary, its stroke of the electromagnetic drive means based on the deviation from the preset outlet pressure of the actual outlet pressure. -
WO 93/16297 -
US 2005/053490 discloses an oscillating-piston drive for a vacuum pump with a piston, which has two piston sections and an intermediate zone provided with a drive magnet. Cylinder sections slidingly receive the piston sections. An annular recess is defined between the cylinder sections at a central yoke. The recess provides space for movement of the drive magnet. An electromagnetic drive which surrounds the piston includes yoke components and coils situated to the sides of said central yoke. -
US-5,957,113 discloses a fuel vapor recovery apparatus for automobiles that includes a canister for cooling and condensing the fuel vapor generated in the fuel tank and a membrane separation means for separating the fuel vapor flowed from the canister. The invention also provides for a membrane separation means for separating the fuel vapor from a canister storing fuel vapor into a fuel rich mixture and a means for liquefying and condensing this separated fuel rich mixture. - A problem associated with prior art is relatively high production costs due to complex arrangements. Maintenance is cumbersome and many of the techniques are sensitive to leakage of vapour past the piston. Another problem is that some of the arrangements are rather bulky and takes a lot of space when mounted inside a fuel dispensing unit.
- It is an object of the present invention to provide an improvement of the above techniques and prior art, which is achieved by a vapour recovery pump that has a first chamber and a second chamber and a vapour flow passage connecting the first chamber with the second chamber.
- A particular object is to provide a double-acting vapour recovery pump that incorporates means that facilitates efficient control of the double-acting effect.
- Other objects and advantages that will be apparent from the following description of the present invention are achieved by a vapour recovery pump and a fuel dispensing unit according to the respective independent claims. Preferred embodiments are defined in the dependent claims.
- Accordingly, a vapour recovery pump for a fuel dispensing unit is provided, comprising a pump housing with a first chamber and a second chamber, each chamber having a vapour inlet valve and a vapour outlet valve, respectively, the chambers being separated by a movable piston arranged to repeatedly decrease and increase the volumes of the chambers. A controllable vapour flow passage is connecting the first chamber with the second chamber, for transportation of vapour from one of the chambers to the other.
- The inventive vapour recovery pump is advantageous in that both sides of the vapour recovery pump may be used for transporting vapour, which renders the pump more insensitive for vapour leakage past the piston. Another advantage is that the pump rate of the vapour recovery pump may be controlled by the control of the vapour flow passage. By a controllable vapour flow passage is meant that the passage is controllable in respect of how much vapour that may be transported from one of the chambers to the other, i.e. the size of an opening in the vapour flow passage may be varied. Further, the direction of the flow of vapour may be controlled.
- The vapour flow passage may be arranged in the piston, and extend from one of the chambers, through the piston, to the other chamber. Alternatively, the vapour flow passage may be formed by tilting the piston, for allowing passage of vapour from one of the chambers, between the piston and the pump housing, to the other of the chambers. As another alternative, the vapour flow passage may be arranged external of the first chamber and the second chamber. These techniques are advantageous in that they each offer a simple way of providing an opening between the two chambers.
- The piston may comprise a magnetic device, for facilitating convenient control of the piston. Preferably, the magnetic device is either a electromagnet, a permanent magnet or a combination thereof.
- The movable piston may have a first side facing the first chamber and a second side facing the second chamber, and electromagnetic control means may be provided to move the piston by altering a magnetic field, and the magnetic device may be arranged between the two sides of the piston, which provides a compact design of the vapour recovery pump.
- The two sides of the piston may each pass a common point along the direction of movement of the piston, when the volumes of the chambers are repeatedly decreased and increased, which results in increased pumping efficiency in respect of the total effective chamber size.
- The pump housing may comprise coils fed by a current for moving the piston, which also provides a compact design.
- In one embodiment, the vapour flow passage may be configured to be substantially open when the piston decreases the volume of the first chamber, and be substantially closed when the piston increases the volume of the first chamber, the outlet valve of the second chamber and the inlet valve of the first chamber each being essentially open when the vapour flow passage is substantially closed. This is advantageous in that the pump may be used basically as a single sided pump, without causing excessive pressure build-up in any of the chambers.
- The vapour flow passage may comprise a controllable valve and a control unit for controlling the flow of vapour through the vapour flow passage, and the direction of through-flow of vapour may be selectable for the controllable valve, which further increases the control options of the vapour recovery pump.
- An overflow valve may be connected to both chambers. A third chamber defining a void may be connected, via a controllable valve, to any of the first chamber and the second chamber. Both features are advantageous in that excessive pressure build-up in the chambers is avoided.
- The vapour recovery pump may further comprise a first vapour line connected to the inlet valve of the first chamber, a second vapour line connected to the outlet valve of the first chamber, a third vapour line connected to the inlet valve of the second chamber, a fourth vapour line connected to the outlet valve of the second chamber, and a vapour circulation line comprising a valve and connecting any of the first vapour line with the second vapour line and the third vapour line with the fourth vapour line. This further increases the control options of the pump, since vapour may be circulated within a chamber.
- According to another aspect of the invention, a fuel dispensing unit for refuelling vehicles is provided, comprising a vapour recovery pump incorporating any of the features described above, wherein a vapour suction nozzle is connected to at least one of the two chambers via a vapour flow line, for transporting flammable fuel vapour. The inventive fuel dispensing unit is, inter alia, advantageous in that it has compact vapour recovery pump that offers a flexible regulation of the rate of vapour recovered via the vapour suction nozzle.
- The vapour suction nozzle may be connected to the first chamber via a first vapour flow line, and a second vapour suction nozzle may be connected to the second chamber via a second vapour flow line, which reduces the amount of components in the fuel dispensing unit.
- The fuel dispensing unit may further comprise a fuel dispensing nozzle arranged at the vapour suction nozzle, a fuel meter configured to measure an amount of fuel dispensed from the fuel dispensing nozzle, and a control device configured to regulate the vapour recovery pump such that the amount of recovered vapour substantially corresponds to the amount of dispensed fuel. Accordingly, this results in quite efficient control of the vapour recovery pump.
- The fuel dispensing unit may further comprise a detector configured to send a signal representative of the hydrocarbon content of the fuel vapour, the control device being configured to receive the signal and to prevent the recovering of vapour, if the hydrocarbon content of the fuel vapour is below a specific level. This is advantageous in that the vapour recovery pump is not operated when a user refuels a vehicle fitted with a system for on-board refuelling vapour recovery.
- Embodiments of the present invention will now be described, by way of example, with reference to the accompanying schematic drawings, in which
-
Fig. 1 is a schematic view of a vapour recovery pump according to a first embodiment of the invention, -
Fig. 2 is a schematic view of the inventive vapour recovery pump comprising magnetic control means, -
Fig. 3 is a schematic view of a vapour recovery pump according to a second embodiment of the invention, -
Fig. 4 is a schematic view of a vapour recovery pump according to a third embodiment of the invention, -
Fig. 5 is a schematic view of the inventive vapour recovery pump comprising various means for reducing pressure in a chamber of the vapour recovery pump, and -
Fig. 6 is a fuel dispensing unit according the invention. -
Fig. 1 illustrates avapour recovery pump 1 that has apump housing 2 withfirst chamber 3 that is separated from asecond chamber 4 by apiston 9 that is movable along a main axis A of thepump 1. The volume of eachchamber piston 1, but the total volume of thechambers first chamber 3 has aninlet valve 5 and anoutlet valve 6, and thesecond chamber 4 has correspondinginlet valve 7 and acorresponding outlet valve 8. - A first
vapour inlet line 20 is connected to theinlet valve 5 of thefirst chamber 3 and a firstvapour outlet line 21 is connected to theoutlet valve 6 of thefirst chamber 3, while a secondvapour inlet line 22 is connected to theinlet valve 7 of thesecond chamber 4 and a secondvapour outlet line 23 is connected to theoutlet valve 8 of thesecond chamber 4. - The
piston 9 has amagnetic device 11 arranged between afirst side 12 and asecond side 13 of thepiston 9. Preferably themagnetic device 11 is a permanent magnet or an electromagnet. - Electromagnetic control means 14, which will be further described below, during operation of the
pump 1 induces an electromagnetic field that repeatedly and alternately attracts themagnetic device 11 towards afirst side 43 of thepump 1 and towards asecond side 44 of thepump 1, which causes an alternating increase and decrease of the volume of thechambers piston 9 moves back and forth along the axis A, which means that eachside - A
vapour flow passage 10 is connected to thefirst chamber 3 near thefirst side 43 and to thesecond chamber 4 near thesecond side 44. The vapour flow passage has avalve 15 that is controlled by acontrol unit 16 in respect of how much vapour that may pass thevapour flow passage 10, and in which direction. - The
control unit 16 may set thevalve 15 to be fully open, completely closed, or to an opening degree ranging from fully open to completely closed. Thecontrol unit 16 may also set the through flow direction of thevalve 15. To achieve this thevalve 15 preferably comprises a first non return valve (not shown) that allows passage of vapour only from thefirst chamber 3 to thesecond chamber 4, and a second non return valve (not shown) that allows passage of vapour only from thesecond chamber 4 to thefirst chamber 3. Each non-return valve may be selectively opened or closed by thecontrol unit 16. - When the
valve 15 is fully closed thepump 1 acts as a conventional double sided pump. However, when thevalve 15 permits a flow of vapour from thefirst chamber 3 to thesecond chamber 4 via thevapour flow passage 10, and when thepiston 9 moves towards thefirst side 43, then theoutlet valve 6 of thefirst chamber 3 and theinlet valve 7 of thesecond chamber 4 remain closed during operation (since pressure levels necessary to open thesevalves second side 44, theinlet valve 5 of thefirst chamber 3 is opened for letting in vapour into thefirst chamber 3, while theoutlet valve 8 of thesecond chamber 4 is opened for letting out vapour from thesecond chamber 4. - When the
valve 15 permits a flow of vapour from thesecond chamber 4 to thefirst chamber 3 via thevapour flow passage 10, and when thepiston 9 moves towards thesecond side 44, then theoutlet valve 8 of thesecond chamber 4 and theinlet valve 5 of thefirst chamber 3 remains closed during operation (since pressure levels necessary to open thesevalves piston 9 thereafter moves to thefirst side 43, then theinlet valve 7 of thesecond chamber 4 is opened for letting in vapour into thesecond chamber 4, while theoutlet valve 6 of thefirst chamber 3 is opened for letting out vapour from thefirst chamber 3. - Hence it is possible to select which side of the pump that shall draw vapour from a vapour source.
- The
pump 1 may also be used while keeping thevapour flow passage 10 closed. In this case the mode of operation is as follows. - When the volume of the
first chamber 3 is increased the volume of thesecond chamber 4 is decreased. This causes a relatively lower pressure level in thefirst chamber 3, which causes itsinlet valve 5 to open for letting in vapour, while a relatively higher pressure level is caused in thesecond chamber 4, which causes itsoutlet valve 8 to open for letting out vapour. Correspondingly, when the volume of thefirst chamber 3 is decreased, the volume of thesecond chamber 4 is increased, a relatively lower pressure level is caused in thesecond chamber 4, which causes itsinlet valve 7 to open for letting in vapour, and a relatively higher pressure level is caused in thefirst chamber 3, which causes itsoutlet valve 6 to open for letting out vapour. - The described operation mode may e.g. be used when two fuel dispensing pistols with vapour recovery nozzles are operated at the same time as is described in connection with
Fig. 6 below. - With reference to
Fig. 2 , the electromagnetic control means 14 has a plurality ofcoils 37 arranged around thepump housing 2. Preferably thecoils 37 are integrated in thepump housing 2. During operation of thepump 1, electrical currents are fed through thecoils 37 which generate a magnetic field that attracts thepiston 9, or more specifically, attracts themagnetic device 11 in thepiston 9. By feeding electrical currents through coils near thefirst side 43 of thepump 1, thepiston 9 is moved towards thefirst side 43. When thepiston 9 is near thefirst side 43, electrical currents are fed through coils near thesecond side 44 of thepump 1, which causes the piston to move towards thesecond side 44. By repeatedly and rapidly altering current levels in thecoils 37, the piston is moved back and forth. - With further reference to
Fig. 3 , in a second embodiment of thepump 1, the flow passage and thevalve 15 is incorporated in thepiston 9. The control options (open, closed, direction of through flow) of the valves in this embodiment are identical to the valves of the previous embodiment. However, thevalve 15 preferably comprises opening and closing members, which define the control options which in turn are susceptible to a magnetic attraction force. The control of the opening and closing members is performed by a magnetic field generated in a suitable manner by the electromagnetic control means 14. - With further reference to
Fig. 4 , in a third embodiment of thepump 1, thepiston 9 is tiltable such that a flow passage, or gap, is formed between thehousing 2 and thepiston 9, which allows vapour to pass directly from one chamber to the other. The functional effect of the tilting corresponds to the functional effect of the previously discussedvalve 15. When the piston is to permit passage of vapour from one chamber to the other, it is tilted, otherwise it is not. This means that thepiston 9 is tilted when it is moved in one direction, and un-tilted when it is moved in the other direction. The tilting is preferably achieved by arranging twomagnetic devices magnetic devices - With further reference to
Fig. 5 , anoverflow valve 17 is connected, via a vapour flow line, to both thefirst chamber 3 and thesecond chamber 4. If the pressure in one of thechambers overflow valve 17 opens for preventing thepump 1 from being damaged by excessive pressure levels. - In one embodiment, the
first chamber 3 is connected to athird chamber 18 via acontrollable valve 19a, and thesecond chamber 4 is connected to thethird chamber 18 via anothercontrollable valve 19b. To reduce the relative level of pressure in any of the first 3 or second 4 chambers, correspondingvalves 19a - To allow regulation of vapour in the
first chamber 3, a firstvapour recirculation line 24 comprising acontrollable valve 30a is connected to the firstvapour inlet line 20 and to the firstvapour outlet line 21. In a corresponding manner a secondvapour recirculation line 25 comprising acontrollable valve 30a is connecting the secondvapour inlet line 22 with the secondvapour outlet lien 23. - The
valves control unit 16. - With reference to
Fig. 6 , afuel dispensing unit 36 incorporates avapour recovery pump 1 according to the description above. Thefuel dispensing unit 36 has a conventional firstfuel dispensing pistol 40 with afuel dispensing nozzle 27 and avapour recovery nozzle 26. Thefuel dispensing nozzle 27 is, via afirst fuel line 31 that has afuel meter 32, in fluid communication with an undergroundfuel storage tank 42. - The
fuel dispensing unit 36 has also a secondfuel dispensing pistol 41 with a fuel dispensing nozzle (not shown) and avapour recovery nozzle 28. The fuel dispensing nozzle is, via a second fuel line (not shown) that has a fuel meter (not shown), in fluid communication with an undergroundfuel storage tank 42. - The
vapour recovery nozzle 26 of thefirst pistol 40 is, via a firstvapour recovery line 33, connected to the inlet valve of the first chamber of thepump 1. Thevapour recovery line 33 hasdetector 39a that detects the level of hydrocarbon in the firstrecovery vapour line 33. Thevapour recovery nozzle 28 of thesecond pistol 41 is, via a secondvapour recovery line 34, connected to the inlet valve of the second chamber of thepump 1. Thevapour recovery line 33 has also a hydrocarbon-detector 39b for detecting the level of hydrocarbon in the secondrecovery vapour line 34. - The outlet valves of both chambers of the vapour recovery pump are connected to the
fuel storage tank 42 via suitable vapour flow lines. - A control device 38 is connected to the fuel meters, to the hydrocarbon-detectors and to the vapour recovery
pump control unit 16. Optionally, the vapour recoverypump control unit 16 is integrated in the control device 38. - When filling a vehicle by means of the
first pistol 40, the rate of dispensed fuel is measured by thefuel meter 32. The control device monitor the rate of dispensed fuel and sends a signal to thevapour recovery pump 1 setting the vapour recovering rate, or pumping rate, to be equal to the fuel dispensing rate. If thedetector 39a detects a predetermined, low level of hydrocarbon content, the vapour recovery pump is stopped. When filling a vehicle by means of thesecond pistol 41, a corresponding operation is performed. - When only one of the
pistols vapour recovery pump 1 is open, such that vapour is drawn into the chamber that has its inlet valve connected to the vapour recovery line that belongs to the pistol that is used. When bothpistols
Claims (20)
- A vapour recovery pump for a fuel dispensing unit, comprising a pump housing (2) with a first chamber (3) and a second chamber (4), each chamber (3, 4) having a vapour inlet valve (5, 7) and a vapour outlet valve (6, 8), respectively, the chambers (3, 4) being separated by a movable piston (9) arranged to repeatedly decrease and increase the volumes of the chambers (3, 4), characterised by a controllable vapour flow passage (10) connecting the first chamber (3) with the second chamber (4), for transportation of vapour from one of the chambers to the other, wherein the controllable vapour flow passage (10) comprises controllable means (15, 11, 11a, 11b, 19a, 19b) adapted to perform a valving effect, and wherein the controllable means are different from the respective vapour outlet valves (6, 8).
- A vapour recovery pump according to claim 1, wherein the vapour flow passage (10) is arranged in the piston (9), and extends from one of the chambers, through the piston (9), to the other one of the chambers.
- A vapour recovery pump according to claim 1, wherein the vapour flow passage (10) is formed by tilting the piston (9), for allowing passage of vapour from one of the chambers, between the piston (9) and the pump housing (2), to the other one of the chambers.
- A vapour recovery pump according to claim 1, wherein the vapour flow passage (10) is arranged external of the first chamber (3) and the second chamber (4).
- A vapour recovery pump according to any one of claims 1-4, wherein the piston (9) comprises a magnetic device (11).
- A vapour recovery pump according to claim 5, wherein the movable piston (9) has a first side (12) facing the first chamber (3) and a second side (13) facing the second chamber (4), electromagnetic control means (14) being provided to move the piston (9) by altering a magnetic field.
- A vapour recovery pump according to claim 6, wherein the magnetic device (11) is arranged between the two sides (12, 13) of the piston (9).
- A vapour recovery pump according to claim 6 or 7, wherein the two sides (12, 13) of the piston (9) each passes a common point (P) along the direction of movement of the piston (9), when the volumes of the chambers (3, 4) are repeatedly decreased and increased.
- A vapour recovery pump according to any one of claims 1-8, wherein the pump housing (2) comprises coils (37) fed by a current for moving the piston (9).
- A vapour recovery pump according to any one of claims 1-9, wherein the vapour flow passage (10) is configured to
be substantially open when the piston (9) decreases the volume of the first chamber (3), and
be substantially closed when the piston (9) increases the volume of the first chamber (3),
the outlet valve (8) of the second chamber (4) and the inlet valve (5) of the first chamber (3) each being essentially open when the vapour flow passage (10) is substantially closed. - A vapour recovery pump according to any one of claims 1-10, wherein the vapour flow passage (10) comprises a controllable valve (15).
- A vapour recovery pump according to claim 11, wherein the direction of through-flow of vapour is selectable for the controllable valve (15).
- A vapour recovery pump according to any one of claims 1-12, further comprising a control unit (16) for controlling the flow of vapour through the vapour flow passage (10).
- A vapour recovery pump according to any one of claims 1-13, wherein an overflow valve (17) is connected to both chambers (3, 4).
- A vapour recovery pump according to any one of claims 1-14, wherein a third chamber (18) defining a void is connected, via a controllable valve (19a; 19b), to any of the first chamber (3) and the second chamber (4).
- A vapour recovery pump according to any one of claims 1-15, further comprising
a first vapour line (20) connected to the inlet valve (5) of the first chamber (3),
a second vapour line (21) connected to the outlet valve (6) of the first chamber (3),
a third vapour line (22) connected to the inlet valve (7) of the second chamber (4),
a fourth vapour line (23) connected to the outlet valve (8) of the second chamber (4), and
a vapour circulation line (24, 25) comprising a valve (30a, 30b) and connecting any of the first vapour line (20) with the second vapour line (21) and the third vapour line (22) with the fourth vapour line (23). - A fuel dispensing unit for refuelling vehicles, comprising a vapour recovery pump (1) according to any one of claims 1-16, wherein a vapour suction nozzle (26) is connected to at least one of the two chambers (3; 4) via a vapour flow line (33), for transporting fuel vapour.
- A fuel dispensing unit according to claim 17, wherein said vapour suction nozzle (26) is connected to the first chamber (3) via a first vapour flow line (33), and a second vapour suction nozzle (28) is connected to the second chamber (4) via a second vapour flow line (34).
- A fuel dispensing unit according to claim 17 or 18, further comprising a fuel dispensing nozzle (27) arranged at the vapour suction nozzle (26), a fuel meter (32) configured to measure an amount of fuel dispensed from the fuel dispensing nozzle (27), and a control device (38) configured to regulate the vapour recovery pump (1) such that the amount of recovered vapour substantially corresponds to the amount of dispensed fuel.
- A fuel dispensing unit according to claim 19, further comprising a detector (39a) configured to send a signal representative of the hydrocarbon content of the fuel vapour, the control device (38) being configured to receive the signal and to prevent the recovering of vapour, if the hydrocarbon content of the fuel vapour is below a specific level.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT06026313T PT1936188T (en) | 2006-12-19 | 2006-12-19 | Vapour recovery pump and fuel dispenser |
EP06026313.4A EP1936188B1 (en) | 2006-12-19 | 2006-12-19 | Vapour recovery pump and fuel dispenser |
ES06026313T ES2702811T3 (en) | 2006-12-19 | 2006-12-19 | Steam recovery pump and fuel distributor |
DE200760012649 DE602007012649D1 (en) | 2006-12-19 | 2007-03-14 | Liquid pump and fuel dispenser |
ES07104125T ES2363712T3 (en) | 2006-12-19 | 2007-03-14 | PUMP FOR FLUIDS AND FUEL PUMP. |
EP07104125A EP1936189B1 (en) | 2006-12-19 | 2007-03-14 | Fluid pump and fuel dispenser |
AT07104125T ATE499528T1 (en) | 2006-12-19 | 2007-03-14 | LIQUID PUMP AND FUEL DISPENSING DEVICE |
US11/960,299 US8512011B2 (en) | 2006-12-19 | 2007-12-19 | Fluid pump and fuel dispenser |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06026313.4A EP1936188B1 (en) | 2006-12-19 | 2006-12-19 | Vapour recovery pump and fuel dispenser |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1936188A1 EP1936188A1 (en) | 2008-06-25 |
EP1936188B1 true EP1936188B1 (en) | 2018-09-26 |
Family
ID=38110180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06026313.4A Active EP1936188B1 (en) | 2006-12-19 | 2006-12-19 | Vapour recovery pump and fuel dispenser |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1936188B1 (en) |
ES (1) | ES2702811T3 (en) |
PT (1) | PT1936188T (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008015144A1 (en) * | 2008-03-20 | 2009-09-24 | GM Global Technology Operations, Inc., Detroit | Pump for conveying fluid in motor vehicle, has channel wrapped at outer side with coils, and conveying element made from material exhibiting ferrous magnetic characteristics provided in channel between openings |
US8474492B2 (en) | 2009-01-28 | 2013-07-02 | Fuel Transfer Technologies Inc. | Automatic shut-off nozzle for use in a non-overflow liquid delivery system |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3826291A (en) * | 1972-12-11 | 1974-07-30 | Mobil Oil Corp | Dispensing volatile hydrocarbon fuels |
DE2409298A1 (en) * | 1974-02-27 | 1975-09-04 | Tomotoshi Tokuno | Electromagnetically-driven piston - has dumb-bell shape with hammer-heads linked by magnetised rod and driven by coils |
JPS5260403A (en) * | 1975-11-12 | 1977-05-18 | Matsushita Electric Ind Co Ltd | Driving device for electromagnetic pump |
US4223706A (en) * | 1978-06-08 | 1980-09-23 | Texaco Inc. | Closed fuel system with vacuum assist |
US4750871A (en) * | 1987-03-10 | 1988-06-14 | Mechanical Technology Incorporated | Stabilizing means for free piston-type linear resonant reciprocating machines |
JPH02145679U (en) * | 1989-05-16 | 1990-12-11 | ||
US5203172A (en) * | 1990-05-17 | 1993-04-20 | Simpson Alvin B | Electromagnetically powered hydraulic engine |
US5957113A (en) * | 1997-03-31 | 1999-09-28 | Nok Corporation | Fuel vapor recovery apparatus |
DE10149506A1 (en) * | 2001-10-06 | 2003-04-10 | Leybold Vakuum Gmbh | Oscillatory piston drive for vacuum pump uses electromagnetic coils cooperating with drive magnet between two sections of vacuum pump piston |
-
2006
- 2006-12-19 EP EP06026313.4A patent/EP1936188B1/en active Active
- 2006-12-19 PT PT06026313T patent/PT1936188T/en unknown
- 2006-12-19 ES ES06026313T patent/ES2702811T3/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
ES2702811T3 (en) | 2019-03-05 |
PT1936188T (en) | 2018-12-27 |
EP1936188A1 (en) | 2008-06-25 |
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